I have lowering blocks on my '53 Studebaker, so far so good. If you are running a lot of power or driving it hard re-arced springs would be the way to go. I will do that with mine once I put a more powerful engine in and probably supplement with some sort of air suspension. There is a local spring company in Sacramento that will either custom build springs or re-do existing. They prefer that you bring the car in as is and tell them what ride height you want. Then you can bring the springs back or they will R&R them for you.

Pat